Carbon Services for CO2 Storage

Schlumberger has over 80 years of experience in mapping, measuring, and modeling underground rock formations. We applied that know-how to become an early leader in the important new technology of carbon capture and storage (CCS), with involvement in more than 60 CO₂ storage projects around the globe.

Participation in a wide range of projects in different geological contexts has provided us with detailed understanding of the varied challenges posed by CO₂ storage. This enables us to integrate the diverse geoscience and engineering disciplines needed to deliver a CO₂ storage project anywhere in the world.

Today, we are a partner in the industry’s major CCS projects. Tomorrow, we will participate as CCS is implemented in new settings such as power stations, oil refineries, steel works, cement plants, and other large emitters. To promote research, understanding and leadership in CCS, we also take an active role in international initiatives, including the CSLF, IEA-GHG, ZEP, GCCSI, and many local consortia.

Storage identification and feasibility

The best way to manage the uncertainties and minimize the risks associated with CO₂ storage is to choose the best storage site.

We developed a range of methods for screening geological basins and comparing different sites. Within your area of interest, we collect the available data, rank the sites based on risk assessment, and select candidates for further characterization.

The key criteria:

• Capacity—Will the site hold as much CO₂ as needed?
• Injectivity—Can we fill the store at the required rate?
• Containment—Will the stored CO₂ remain safely in place?

Other factors include public opinion, regulatory requirements, and financial and environmental impacts.

Making best use of the available data, we work with you to reach an informed decision of where to invest in the next stage—site appraisal.

Site appraisal

Site appraisal describes the comprehensive measurements and modeling needed to confirm the suitability of a site. This phase is essential to understand the geology and behavior of the site in great detail.

We apply the selected Schlumberger risk-based approach to characterize the site in detail, integrating measurements, models, expertise, and technologies to evaluate storage performance. The process follows exploration methods deployed for decades in the oil and gas industry and adds new techniques tailored to the special needs of CO₂ storage. Schlumberger designs appropriate evaluation programs:

• the geological structure of the site may be imaged from surface using seismic data or other technologies
• wells can be drilled and rock properties investigated using logging tools; rock and fluid samples can be taken for laboratory measurements
• injectivity can be assessed using fluid flow testing.

The findings from these and other investigations are integrated to produce models of storage performance, together with plans for monitoring and risk mitigation.

These models examine geochemical and geomechanical processes to simulate and test a range of scenarios covering injection rates, fluid displacement, CO₂ trapping and containment performance.

Development and injection

Together, we select the best development and technology options, including the well location, construction techniques, and monitoring methods.

Meeting performance objectives while minimizing risk and uncertainty is central to our process for developing a specific plan for safe and effective storage.

Injection wells are systems-engineered with the durability to both deliver the CO₂ to the storage target and to isolate and protect the intervening formations.

Our drilling and well construction services help maximize the quality and stability of wells crucial to long-term integrity.

Before injection starts, we design and construct monitoring wells equipped with sensors. Baseline monitoring readings are then taken from the wells and surface systems. The injection phase typically lasts from 10 to 50 years and, throughout that time, we monitor the storage system to compare actual storage performance against predictions.

Independent verification provides regulatory assurance

Models of storage performance, carried forward from the design phase, are updated regularly with monitoring data. If a significant deviation from plan is detected, risk mitigation and remediation actions are implemented. Schlumberger geoscientists integrate all these subsurface activities to ensure a secure storage site.

Postinjection

CO₂ storage is still an emerging technology: regulation and best practice will evolve in the next decade. Whatever the detailed requirements, at each site, the wells will need to be safely plugged for long-term integrity, the surface equipment removed, and appropriate monitoring continued.

High confidence in long-term integrity will only be achieved by having a site that has been well chosen, well designed, well operated, and well monitored.

That’s what we do.